That is great. Obviously in the next one they have to change a lot of things to keep it fresh (this isn't CoD afterall where people just want to buy the same game over and over). Zelda fans want fresh new adventures and this game certainly provided it. Keeping the open world sense of freedom while changing up some things is definitely the way to go. Figuring out how to include a story in such a freely open world game is a big challenge for them. Definitely need to add back in some real dungeons, while keeping some shrines around too would be cool. They should keep weapon durability but perhaps make the weapons last a little longer (maybe throw in more enemies wandering around so that longer lasting weapons makes sense). Definitely add enemy variety. I'd like to not see cooking in the next game, as then it'd feel too similar to BotW, but perhaps replacing food with some other sort of collectibles you need to use throughout the game. Maybe something like making potions that work pretty much the same as cooking in terms of finding items and combining them but they are for battle potions instead of cooking food.
Would love to see a story like Ganon has taken over hyrule and decimated hyrulian forces so you have to travel around the world defeating his forces that occupy several "dungeon" type areas. Same sense of freedom but you have to actually defeat major areas to drive the story forward. A little bit of linearity in there to drive the story mixed with huge freedom to still explore just about anywhere at any time.